1,1

a(n+1)/a(n)~5.

Do[ Print[ Length[ Union[ Table[ PowerMod[2, i, 10^n], {i, 5^n}]] ]], {n, 10}]

Cf. A095810, A113023.

Adjacent sequences: A113019 A113020 A113021 this_sequence A113023 A113024 A113025

Sequence in context: A017967 A076901 A080043 this_sequence A014986 A015531 A083425

nonn

Paul D. Hanna (pauldhanna(AT)juno.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 27 2004